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Factory (OEM) tow package required for installation
Warranty: One-Year Limited Warranty
Electrical System Type: 2W
Output Type: 4-Way Flat
Installation Difficulty: Novice
Installation Time Exact (Minutes): 5
CURT custom wiring connectors are the easiest way to outfit your vehicle with a CURT trailer wiring connection. They are built with some of the most advanced technology in the industry, and each one is custom-fitted to work with a specific make and model. Some automotive manufacturers install a special socket on the vehicle to be used for vehicle-to-trailer wiring. Although this special socket is not equipped on every vehicle, a CURT custom wiring connector -- also called a T-connector -- utilizes the socket for simple, stress-free installation. Rather than requiring you to cut, splice and solder into your vehicle's wiring system, the custom wiring connector uses a single OEM-compatible plug and instantly provides a standard, universal vehicle-to-trailer wiring connection, typically in the form a 4-way flat. All CURT custom wiring connectors are made vehicle-specific for the easiest possible installation and the best fit. This particular plug-in connector provides a 4-way flat socket and is designed to be a custom wiring option for certain years of the Ford Explorer, Mercury Mountaineer and Lincoln Aviator (factory tow package required; to verify your vehicle compatibility, see application info). It comes with all necessary hardware to establish a solid connection. It also comes with a dust cover to keep the connector socket clean when not in use. To ensure long-lasting reliability, all CURT custom wiring connectors are thoroughly tested for optimal functionality. Stress is the last thing you should feel when towing a trailer -- whether you're hauling your RV to that favorite camping destination, your ATVs up to the hunting grounds or your fishing boat to the new hidden hotspot. At CURT, we think your towing equipment should add to the enjoyment of your experience, not detract from it.
CURT offers a variety of high-quality trailer hitches and accessories for select vehicle models. Find the perfect fit for your towing needs at TowUniverse.
CURT, a Lippert brand, offers a complete line of towing products and is the leading manufacturer of custom-fit trailer hitches. We offer the broadest selection of custom-fit hitches, and each one is designed, welded, and coated in Wisconsin.
CURT is also a leader in flat towing products, as well as 5th wheel, gooseneck, and weight distribution hitches, ball mounts, electrical components, cargo solutions, and other towing accessories.
For everything from passenger cars and vans to full-size pickups and SUVs, CURT is 'The First Name in Towing Products®.'
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3 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2002 - 2005 | Ford Explorer | Installation Time: 30-60 minutes |
| 2003 - 2005 | Lincoln Aviator | Installation Time: 30-60 minutes |
| 2002 - 2005 | Mercury Mountaineer | Installation Time: 30-60 minutes |
Yes, Curt part 55251 fits Ford Explorer models equipped with a factory tow package. The connector is designed for vehicles with a factory 4-flat connector. Check your vehicle owner's manual or contact the vehicle manufacturer to confirm your Explorer has the tow package.
Yes, the Curt 55251 custom wiring connector is compatible with Lincoln Navigator models that have a factory tow package. Your Navigator must be equipped with the tow package to use this connector.
Yes, the Curt 55251 is compatible with Mercury Mountaineer models that have a factory 4-flat connector and tow package. Verify your Mountaineer has the factory tow package before purchasing.
Yes. The Curt 55251 is designed for vehicles with a factory tow package. All listed applications (Ford Explorer, Lincoln Navigator, and Mercury Mountaineer) require the tow package. Check your vehicle owner's manual or contact the vehicle manufacturer to confirm your vehicle has this package.
The Curt 55251 is a custom wiring connector that connects your vehicle's factory taillight wiring harness to a 4-flat trailer connector. It allows you to safely power trailer lights using your vehicle's existing electrical system.
The vehicle taillight wiring harness connector is located behind the passenger-side rear bumper. Refer to the wiring location diagram on page 1 of the installation instructions for the exact location on your vehicle model.
1. Locate the vehicle taillight wiring harness connector behind the passenger-side rear bumper. Remove the protective dust cover and clean any debris. 2. Insert the custom wiring connector into the vehicle connector, ensuring the connectors are fully inserted with locking tabs in place. 3. Route the 4-flat to the center of the vehicle and out of the trunk when in use. When not in use, roll up and store in the trunk. 4. Secure loose wires with the provided cable ties. 5. Install the provided 4-flat dust cover to prevent corrosion.
No. The Curt 55251 is inserted directly into the existing vehicle taillight wiring harness connector. You do not remove the factory connector; instead, you insert the custom wiring connector into it.
When not in use, roll up the 4-flat connector and store it in a convenient, out-of-the-way location inside the trunk. This protects it from damage and keeps it organized.
The Curt 55251 includes the custom wiring connector, a 4-flat dust cover, and cable ties for securing loose wires.
Do not exceed the product rating or your tow vehicle's lamp load rating, whichever is lower. Exceeding either rating can cause loss of warranty, overheating, and potential fire. Refer to your vehicle owner's manual for the tow vehicle lamp load rating, or contact the vehicle manufacturer for the specific product rating.
Test the connector for proper function using a test light or by connecting a properly wired trailer. This ensures the wiring connector is functioning correctly before towing.
Route the 4-flat connector to the center of the vehicle and out of the trunk when in use. This ensures proper cable routing and prevents damage to the connector or wiring.
The provided cable ties are used to secure any loose wires during installation. This keeps the wiring organized and prevents tangling or damage.
The provided 4-flat dust cover helps prevent corrosion of the connector. Installing it protects the connector from moisture and debris, extending its lifespan.
Before inserting the custom wiring connector, locate the vehicle taillight wiring harness connector behind the passenger-side rear bumper. Remove the protective dust cover and clean any debris from the connector to ensure a proper connection.
The custom wiring connector is fully inserted when the locking tabs are in place. Ensure the connectors are fully seated before proceeding with the installation.
The Curt 55251 fits Ford Explorer, Lincoln Navigator, and Mercury Mountaineer models equipped with a factory tow package.
No drilling is required. The connector inserts directly into the existing vehicle taillight wiring harness connector behind the passenger-side rear bumper.
No tools are required for installation. The manual lists 'None' under Tools Needed.
Do not exceed the product rating or tow vehicle lamp load rating, whichever is lower. Exceeding either can cause loss of warranty, overheating, and potential fire.
Test the connector using a test light or by connecting a properly wired trailer to verify proper function.
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